Indexcjc, Rev. 31.01.2014Index of Pipe wall Thickness
Calculation1ASME B31.3 # 303.8Recommendations for minimum
thicknessesPressure design of componentes9ASME B36.10M Schedule /
Identification2ASME B31.3. Chapter 1ASME B36.19M & ASME B36.10M
Schedule /Part 3. Fluid serviceIdentification3Table A-1 ASME
B31.3-200210Corrosion Allowance for ASME B31.3 Piping"Basic
allowable stresses in tensions for metalsCarbon steel pipes and
tubes11Appendix M. Guide to classifying fluid services4Table A-1B.
ASME B31.3-200212ASTM A106, API 5L and ASTM A 53 SeamlessBasic
casting quality factors Eccarbon steel pipes. Pressure and
TemperatureTable A-1B. ASME B31.3-2002Ratings. Table of Maximum
Allowable PressureBasic quality factors for longitudinal weld
joints(kPa), for different pipe sizes and temperaturesin pipes,
tubes, and fittings Ej13ANSI B16.5 - Maximum Press. and Temp.
Ratings5Table 304.1.1 .ASME 304.1.1-304.2.1Non-shock pressure
(psig) and temperature ratingsY coefficientfor steel pipe flanges
and flanged fittingsFor t < d/614Sample wall thickness
calculation6ASME B1.20.1 83Table 2. Basic dimensions of American
National15Pressure ratings and maximum allowable pressuresStandard
Taper Pipe ThreadReferences7ASTM A 106, ASTM A 53 and API 5LTable
9.- Tolerances for Wall ThicknessMill toleranceNext revision will
include stainless steel materials
Wall thickness calculationPag. 1 of 2Nota 1La unidades que se
indican u otras vlidasPag. 2 of 2Pipe wall thickness calculation
according ASME B31.32.-Pipe exterior diameter6.-Pressure design
thickness value (tdis)(Note 6)9.- Required thicknesso (treq)dn
=2inNota 2Funcin para el dimetro exterior de caeras de acero al
carbonotdis =P * dext / ( 2* (sallow * E + P* Y) )Ec. 3aASME B31.3,
#304.1.1, Ec. (2)Datade =60.3mm(Note 2)Pipe_Imp_CS_Dext_dnP
=2.00MPatreq =tdis + OT(Sheet 1)Pipe (CS) material (Note 1)1d
=60.3mmtdis =0.03mmWeld joint type (Note1)23.-Material allowable
stress(Note 3)Nota 3Interpolacin el esfuerzo admisible a la
temperatura "t", en Tabla A-1Hoja 3sallow =2,199MPaOT
=3.50mmNominal diameterdn =2in 3ASME B31.1,Table A-1t =80C(Para t
< 38 C, la tabla utiliza 38 C)E =1-treq =3.53mmDesign pressureP
=2Mpa 4sallow =2,199MPa(Sheet 3)Row =16(Selected material)Y
=0.4-Design temperaturetemp =80C 5tdis =0.03mm10.-Mill tolerance
(MT)Corrosion allowanceTC =1.59mm 64.- Quality factor "E" for the
given longitudinal weld typeDe Hoja 2Table 9.- Mill tolerance for
the given pipeThread (Yes/No)Hilo =Yes7(Note 4)Col_A =3tA =37.8CsA
=103.4MPa7. Thread(Note 7)Allowance in percentage of specified
thicknessMaterial:API5L Gr. A25and a longitudinal weldCol_B =4tB
=93.3CsB =2861.3MPaThread =YesMT =12.5%(Sheet 6)1.-Pressure design
thicknesstype:SForPipe minimum nominal thickness (tmin)The pressure
design thickness "t" is calculated according equationASME B31.3,
Tabla A-1B givesS =sB + (sA - sB) * (tb - t)/(tb - ta)dn =2intmin
=treq * (100 /(100 - TF)(3a of ASME B31.3 paragraph 304.1.2E
=1(Sheet 4)S =2199MPaTable 2, ASME B1.20.1-1983, gives following
number oftreq =3.53mmthreads per inchMT =12.5%(Sheet 1)5.- "Y"
coefficient for equation (3a)Nota 4Factor "E" de Hoja 4.- Table
A-1BHoja 4NT =11.5threads/inch(Sheet 6)tmin =4.03mmTabla 304.1.1
should be used for t < d/6For a number of threads per inch NT,
Table 1,d =60.3mmMaterialAPI5LASME B1.20.1-198 gives a thread
depth(TD)11.- Selected shedule (SCH) and resulting thickness
(s)tdis: design thickness by pressure[mm]d/6 =10.05mmCorrect. s
< d/6Welding typeSTD =1.91mm(Sheet 6)SCH =80(Note 8)9P: design
internal pressure[Mpa gauge]ASME 304.1.1-304.2.1, Table 304.1.1.
gives for:(Note 4)E-factor1dn =2inde: pipe exterior
diameter[mm]material type:88.- Over Thickness "OT"s
=Pipe_Imp_CS_Thickness_dn_schs: material allowable stress[MPa]and
Temperature:80CNota 5Interpolacin coeficiente "Y", de Tabla
303.1.1Hoja5OT =TC + TDs =5.54mmE: Quality factor[-]following "Y
coefficient"TC =1.59mmY: coefficient from Table 304.1.1[-]Y
=0.4(Sheet 5)t =482C(Para t < 482 C, la tabla utiliza 482 C)TD
=1.91mmSchedule80gives a thickness greater than(Para t > 621 C,
la tabla utiliza 621 C)OT =3.50mmthe calculated requiered
minimumcjc, Rev. 31.01.2014In columns "!P" to "W", it is posible to
see the calculationThe nine (9) cells in gelb are required
inputsCol_A =1tA =482CYA =0.4steps.The last input (#9) correspomds
to the schedule that shall beCol_B =2tB =510CYB =0.5#1.-Welding
type#4.-Quality facto "E" is determined fron Table A-1BTo see these
columns, if they are hiddeen, click on theselected to obtain a
thickness larger than the in point #10SSeamless pipefor the
selected material and weld joint type.plus sign "+" in the upper
teil of the sheet.calculated minimum required.312345ERWElecric
Resisitance Welded pipe482510566593621EFWElectric FusionWelded
pipe#5.-"Y" coeficient of Eq. 3a is determined by interpolationTo
see hidden sheets,For result checking,see example in sheet "14.
Example"12345FBWFurnace Butt Welded pipefrom Table 303.1.1, for the
selected material and- Right click on any sheet-labelAlso, see
Recommended minimum thicknes in sheet
71Austenitic_steel0.40.40.40.50.7temperature- click on
Unhide2Cast_iron0N/AN/AN/AN/A#2.-Pipe exterior diameter is obtained
with the function3Ferritic_steel0.40.50.70.70.7de
=Pipe_Imp_CS_Dext_dn#6.-Use any consistent set uf unitsValidation
list for thread
selection4Other_ductile_metals0.40.40.40.40.4Yes1234567#3.-Allowable
stress for selected material and temperature#7.-When thread is to
be considered, the number ofNois calculated by interpolation in
Table A-1 of sheet 3threads per inch id obtained from Table 2 and
theY =YA + (t - tA) / (tb - tA) * (YB - YA)thread heiht from Table
1 of sheet 6.En columnas P a W, se pueden ver los pasos del clculoY
=0.4y las notas.#8.-Select a shedule, that with the used
nominalPara ver estas columnas, si estn ocultas, hacer clickNota
6.La unidades que se indican u otras vlidasdiameter, will give a
thickness larger than theen el signo "+", en la parte superior de
la hoja.minimum calculated calue "tmin"Nota 7Si existe hilo, Tablas
2 y Tabla 3 entregan la profundidad del hiloTable 2.Table
1NPSThreads/inThreads/inH
(mm)1/1627270.8148321/827181.2219941/418141.5712443/81811.51.9128741/21482.749553/414111.51
1/411.51 1/211.5211.52 1/28383
1/2848586888108128148168188208248dnSchin-1/253/4101201
1/2302403604805100612081401016012STD14XS16XXS18202224262830323436384042444648
1. #304.1.2ASME B31.3 - 2002 - 1ASME B31.3 # 303. Pressure
design of componentesASME B31.3, #304.1.1, Eq. (2)Equation (3a) of
ASME B31.3 paragraph 304.1.2t :pipe wll thickness (measure or
minimum perpurchase specificationP:internal design pressure
gauge[Pa]dext:Exterior pipe diameter [mm]s =Stress value for
materialfrom Table A-1[Pa]E :quality factor from Table A-1A or
A-1BY :coefficient from Table 304.1.1 , valid fort < dext / 6t
dext / 6Ferritic steelAustenitic steelCast ironSheet 5Coefficient
YASME 304.1.1-304.2.1Table 304.1.1.For t < d/6t